T/SEAMTA 000003-2019 Short-circuit test transformer

Scope

Main technical content: Most short-circuit test transformers are designed as single-phase units, and different connection methods (such as series, parallel, Y-connection, and D-connection) can be formed through their external terminals, meeting the overcurrent test requirements of single-phase or three-phase power equipment. Some short-circuit test transformers are also designed as three-phase units, typically used for overcurrent tests of three-phase power equipment. For short-circuit test transformers with series connections in the primary or secondary windings, when lightning full-wave impact tests (LI) and lightning cut-off wave impact tests (LIC) are conducted at the corresponding winding ends, oscillation voltages much higher than the input wave values may appear at the connection points between different windings, which may determine the design of the main and longitudinal insulation of the corresponding parts of the transformer. The test operation time of short-circuit test transformers is generally very short, and the temperature rise of the windings will not become a factor affecting their reliability. For short-circuit test transformers requiring long-term no-load operation or load operation, the temperature rise of the iron core should not be ignored. The normal working condition of short-circuit test transformers is to frequently withstand overcurrents, and this operating characteristic is a significant difference from that of power transformers. The ability of short-circuit test transformers to withstand frequent short-circuits, especially their dynamic stability, should receive sufficient attention from manufacturers and users.

Development Information

Related Standards